Fabrication of cerium doped Ti/nanoTiO2/PbO2 electrode with improved electrocatalytic activity and its application in organic degradation
Fabrication of cerium doped Ti/nanoTiO2/PbO2 electrode with improved electrocatalytic activity and its application in organic degradation
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DOI：
10.1016/j.electacta.2016.03.168
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发表时间：
2016-05
影响因子：
6.6
通讯作者：
Mai Xu;Wang Zhicheng;Fengwu Wang;Ho Ping;Wang Canyong;Ou Xuemei;Zhu Chuan-gao;Wei Yijun;Yunhu Hun;Wenyan Fang
中科院分区：
文献类型：
--
作者：
Mai Xu;Wang Zhicheng;Fengwu Wang;Ho Ping;Wang Canyong;Ou Xuemei;Zhu Chuan-gao;Wei Yijun;Yunhu Hun;Wenyan Fang
采用溶胶-凝胶法和电沉积法制备了稀土铈掺杂Ti/nanoTiO 2/PbO 2电极（Ti/Ce-nanoTiO 2/Ce-PbO 2）。结果表明，铈掺杂的纳米TiO 2作为底层不仅可以提高电催化性能，而且可以抵抗电极的腐蚀。采用扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和X射线衍射（XRD）对薄膜的表面形貌和结构进行了表征。SEM照片表明，Ti/Ce-nanoTiO 2/Ce-PbO 2电极表面均匀，颗粒较小。用循环伏安法（CV）、线性扫描伏安法（LSV）和电化学阻抗谱（EIS）研究了电极的电催化活性。Ti/Ce-nanoTiO 2/Ce-PbO 2具有较大的电化学活性表面积和较小的电荷转移电阻，具有较高的电催化活性。研究了该电极对模拟染料废水甲基橙子（MO）的电催化氧化，探讨了该电极在环境科学中的潜在应用。当电流密度为50 mA cm-2，处理时间为120 min时，降解50 mg L-1 MO的COD去除率和平均电流效率分别为96.6%和14.6%。Ti/Ce-nanoTiO 2/Ce-PbO 2具有良好的电催化性能，是一种很有前途的低成本尺寸稳定阳极，可用于水溶液中有机污染物的处理。
In this work, the rare earth cerium (Ce) doped Ti/nanoTiO2/PbO2electrode (Ti/Ce-nanoTiO2/Ce-PbO2) was successfully prepared using sol-gel and electrodeposition. It was found that the cerium doped nano TiO2as underlayer could not only increase electrocatalytic property but could also withstand corrosion of the electrode. The surface morphology and the structure of the prepared thin film were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. SEM images indicated that the surface of Ti/Ce-nanoTiO2/Ce-PbO2electrode was more uniform and had smaller particles. Cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were also used to study electrocatalytic activity of electrodes. The large electrochemical active surface area and small charge transfer resistance resulted in the high electrocatalytic activity of Ti/Ce-nanoTiO2/Ce-PbO2. Electrocatalytic oxidation of methyl orange (MO) as a model dye wastewater in aqueous solution was studied to evaluate the potential applications of this electrode in environmental science. The chemical oxygen demand (COD) removal and average current efficiencies were about 96.6% and 14.6% for degrading 50 mg L−1MO at a current density of 50 mA cm−2and treatment time of 120 min. The good electrocatalytic performance of Ti/Ce-nanoTiO2/Ce-PbO2makes it a promising anode as low-cost dimensionally stable anodes (DSAs) for treatment of organic pollutants in aqueous solution.